(Basic) Press on the switch button until it clicks to switch on. Press the switch again for off. Access output groups 1 & 2 by tighten or loosen the head. Slightly press the switch to switch between different outputs.

(Advance) 1) Lower low output -With "Lower low" function disabled, lowest (second lowest) output will increase by about three (two) times. Toggle this setting starting with head loosens, turn on the light, and then repeat tight and loose for three times. 2) Mode memory - remebers the last output in group 1. To toggle this setting, with head tighten, turn on the light, and repeat loose and tight for three times.

* Using 3.7V li-ion significantly increase the LED output and heat. Limit each usage to five minutes or less at high and turbo output. Hold the light in your plam to help removing heat from the LED. If you find the flashlight too warm to hold, turn off the light, or lower the output to allow it to cool down. Do not leave the light running unattended.

* D3A Ti head is made in one piece, and therefore its glass lens is not user replaceable.